X-Message-Number: 12230
Date: Sun, 8 Aug 1999 09:22:39 -0700 (PDT)
From: Doug Skrecky <>
Subject: head cooling does not cool an active brain

  Corbett RJ.  Laptook AR.
  Ralph Rogers and Mary Nell Magnetic Resonance Center, Department of
  Radiology, University of Texas Southwestern Medical Center at Dallas,
  75235-9085, USA.
  Failure of localized head cooling to reduce
  brain temperature in adult humans.
  Neuroreport.  9(12):2721-5, 1998 Aug 24.
  Non-invasive brain temperature measurements using proton magnetic resonance
  spectroscopy were used to test the hypothesis that localized
  head cooling would reduce brain temperature in 10 normal adult humans.
  Temperature reductions of the head surface to 15.8+/-3.5 degrees C did not
  reduce brain temperature measured in the superficial cortex (36.8+/-0.5
  degrees C) or thalamus (36.6+/-0.7 degrees C), as compared to measurements
  obtained with a head surface temperature of 34.7+/-1.6 degrees C (37.0+/-0.6
  degrees C and 36.6+/-0.4 degrees C, respectively). There was no change in the
  temperature gradient from the superficial to deep brain locations in the
  presence or absence of head cooling, and brain temperature did not decrease
  as a function of the duration of head cooling for periods up to 50 min. There
  was no correlation between the scalp surface (range: 10-38 degrees C) and
  brain temperature at either the deep or superficial locations.

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